The magnet below is cut in half. what will be the result?

C

Explanation:

Magnets are always dipole meaning it will always have a north and south. (There has been one case of a monopole magnet discovered in Valentine's day 1982, but that's beside the point). Therefore we can deduce B and D is incorrect. This leaves A and C. It is not A because it inverts the north and south side, thus leaving C.

a electromagnetic waves

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =